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J. W. BARTLETT.

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- J. W. BARTLETT.

RIVETING MACHINE.

No. 392,487. Patented Nov. 6,1888.

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ilNiTED STATES Pars JOHN IV. BARTLETT, OF MOLINE, ILLINOIS, ASSIGNOR TO THE M'OLINE PLOW COMPANY, OF SAME PLACE.

RlVETlNG-MACHINE.

SPECIFICATION forming, part of Letters Patent No. 392,487, dated November 6, 1888.

Application filed August 28, 1888. Serial No. 283,950. (No modrl.)

To aZZ whom it may concern:

Be it known that 1, JOHN WV. BARTLETT, of Mohne, 1n the county of Rock Island and State of Illinois, have invented certain Improve ments in Rivcting-llfachincs, of which the following is a specification.

The aim of my invention is to provide a simple and inexpensive power-driven machine in which a weight shall be rendered available to complete the riveting or heading operation at a single stroke and to automatically return the parts to and hold them in suitable position to permit the removal and introduction of the objects to be acted upon.

In the accompanying drawings, Figure 1 is a slde elevation of my machine. Fig. 2 is an elevation of the same from opposite sides,with portions in section. Fig. 3 is an end elevation of the same, partly in section.

Referring to the drawings, A represents a rigid frame or body, usually cast in one piece, mounted on supporting-legs a. At its forward end the frame sustains in ordinary guides thereon a vertical sliding head, 13. This head is connected by a link, 0, to one end of a lever, I), which latter is fulcrumed at d in the frame and extended thence to the rear end of the frame, where it is in turn jointed to the upper end of a rod or pitman, E, which latter has its lower end mounted upon and around an eccentric, F, on a transverse shaft, G, seated in bear ings in the frame. The shaft is provided with a pulley, H, over which a slack constantly-running driving-belt, I, is passed. The shaft is also provided with a flywheel, K. heavily weighted on one side, as shown at K, to overbalance the weight of the sliding head. A footlever, L, pivoted to the frame, carries an idlepulley, M, to act against and tighten the belt when it is required that it shall turn the pulley. A brakelever, N, also pivoted to the frame, acts against the pulley to arrest its motion after each riveting action. The sliding head B contains a verticallyadjustablc stock or mandrel, b, secured therein, so that it can be adjusted Vertically, and the mandrel in turn carries a detachable die or riveting-tool, I), held in place by a set-screw, Z)", or other means such as are commonly used for like purposes.

Below the riveting-head there are two co-operating jaws, O O, seated on a suitably-formed portion of the frame and connected thereto by vertical pivots 0 in suitable position to grasp the vertical end of the spoke 1 between them and hold it in position to receive the pressure of the tool b upon its end. These jaws will also serve to sustain the tire or rim B when the machine is used for securing spokes in metal wheels. Thcj aw 0 remains ordinarily ill a fixed position, but is adjustable by a screw, S, so that spokes of different diameters may be properly centered beneath the tool. The jaw O is urged backward by a spring, T, and is forced and held inward at the proper time by a single screw, U, mounted in the frame and provided with an operating-handle, U. This handle is ordinarily curved and arranged to bear on the brake-lever N, as shown, so that when the handle is depressed to open the jaws and release the headed spoke or rivet it also acts upon the brake-lever to insure the stoppage of the wheel.

In operating themachinc the spoke is inserted between the jaws and the handle U operated to close them tightly thereon. At the same moment the hand-lever is operated and the belt tightened to act momentarily on the drivingpulley, thereby setting the shaftec centric and the fly-whecl in motion.

The eccentric through the intermediate parts causes the tool or die to begin its descent during the action of the belt. The momentum of the fly-wheel is such that,although the belt ordinarily ceases its action before the riveting action is completed, the wheel will continue to carry the tool downward and complete the ri v eting action, and thereafter raise the tool again to its first position. The weight, gravitating to the lower side of the wheel, keeps the riveting-tool and the head at rest in the elevated position. It will be understood, of course, that the weight of the wheel is to be proportioned to the force required in heading the blocks, and the weight of the wheel is to be so located or distributed that when it has gravitated to its lowest position the tool will be raised, and vice versa.

In practice I find that a machine constructed as herein described to receive an initial move ment or impetus from the belt and to complete its action by the inertia of the parts may be operated more rapidly and with better results than those in which the driving devices act positively throughout the entire operation of the machine.

It is to be understood that the brake lever is not a necessary feature of the machine, as the wheel will, if properly weighted on one side and driven at a proper speed, bring the parts to a state of rest at the end of the stroke.

The driving-pulley may be dispensed with and the driving-belt and brake applied to the flywheel, if preferred, it being oviously immaterial Whether the motion is communicated to the shaft through the weighted wheel or through a special pulley, the essence of theinvention residing in the combination, with the punch-operating mechanism, of the revolving; weight, by which they are caused to complete their action and to return to their normal po sition.

It will be perceived by the skillful mechanic that the mechanism herein shown for transmitting motion from the main shaft to the die carrier is similar to that now in common use in punching and riveting machines. It may be replaced by any other suitable mechanism known in the art for communicating motion from a rotary driving shaft to a reciprocating die-carrier.

While I recommend the employment of a slack beltand tightening device the most simple means for imparting an intermediate rotation to the driving-shaft, it is obvious that other contrivanees now familiar to the skilled mechanic may be employed, the only requirement in this regard being that the shaft shall receive from a continuously-running drivingbclt an intermitting rotary motion.

Having thus described my invention, what I claim is 1. In a riveting-machine having a rotary drivingshaft connected through intermediate mechanism to a reciprocating punch-carrier, as usual, a weight secured eccentrically to the shaft to overbalance and lift the die-carrier.

2. In a riveting-machine, the sliding head provided with the riveting tool or die, its actuating-lever, the pitman connected to the lever, the eccentric, the shaft, and the Wheel on said shaft suitably weighted, as described, to overbalance and lift the head.

3. In combination with the die carrying head, the rotary driving-shaft, and suitable mechanism for imparting motion to the head therefrom, the wheel loaded on one side, the pulley, the slack driving-belt, and the pulleytightener.

4. In a riveting-machine, a reciprocating punch-carrier, the rotary tightening-shaft, intermediate mechanism connecting the shaft and die-carrier, the pulley on the shaft, the brakelever to arrest its motion, and a Weight eccentrically applied to the shaft in position to lift the die-carrier.

5. In a riveting-machine, and in combination with its operating-wheel, the clampingjaws, the handle or lever for closing said jaws, and the brake-lever acting at one end on the pulley and acted upon by the jaw-closing lever, as described, whereby the opening of the jaws is caused to effect the stoppage of the wheel.

In testimony whereof I hereunto set my hand, this 6th day of August, 1888, in the presence of two attesting witnesses.

JOHN WV. BARTLETT.

Witnesses:

.T. W. EKLUND, A, A. CRAMr'roN. 

